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Narrow alleyways and streets were covered from side to side by long sheets of cloth to hide fighters manoeuvring form coalition spy planes.

And ISIS has even formed its own navy - a flotilla of smuggling and assault craft on the Tigris which in January needed a breathtaking 100 strikes to take out.

It also emerged that ISIS fighters were buying and selling women as slaves using fingerprints on documents as a bill of sale.

One chilling paper found in the liberated city shows how ISIS controlled the selling of captured woman for over $1,000 - many of them Yazidis.

The receipt is signed with fingerprints by the buyer and seller and describes the woman in stark, matter of fact terms as “20-years-old, physically fit with brown eyes” - costing around £1,145.

The streets of the old city in Western Mosul (Image: Rowan Griffiths/Daily Mirror)

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The seller was called Abu Zubair and the buyer was named as Abu Monem.

But ISIS-controlled areas of Mosul also saw a disgusting trade in Yazidi children.

It is believed that 6,470 Yazidis who were kidnapped by ISIS when the militant group attacked Sinjar in August 2014.

Most men were killed and dumped in mass graves but women and children were abducted and sold into slavery.

Younger children changed hands for around $500 - £381 – and were sold to couples who could not have children to be brought up as Muslims.

Older boys were forced to train as fighters – or sold as slaves if they were unfit for the frontline.

One youngster – now liberated – said he was handed to a family for just £45 after being shot and wounded in 2014.

Iraqi troops in the old city (Image: Rowan Griffiths/Daily Mirror)

He said: “The family used to take me to the market and made me carry all the groceries. And inside the house, I had to do chores all day.”

ISIS monsters believe they are free to murder, rape, torture and abuse Yazidis because they are considered devil worshippers.

In one horrific incident they cooked the baby son of a Yazidi sex slave and fed him to his unsuspecting and starving mother and in another a ten-year-old girl was raped to death by evil Jihadists in front of her parents and five sisters.

Some Yazidis are buying captive women and girls back from ISIS thugs.

Yazidism is an ancient faith that integrates some Islamic beliefs with elements of Zoroastrianism, the ancient Persian religion, and Mithraism, a mystery religion originating in the Eastern Mediterranean.

Yazidis began to face accusations of devil worship from Muslims in the late 16th and early 17th centuries.